that, as the fbi warns extremist groups could act stateside. news 4 melissa is here with more. >> the protests continue to grow across the middle east. four arrests have been made in the deaths of four americans earlier this week. several more suspects are under surveillance. now, the u.s. is sending a marine security team into yemen. they are small but violent protests. for the third day, the embassy in cairo is under siege. protesters haven't left the streets, clashing with the military throwing stones and molotov cocktails. erecting a new con treat wall to prevent mobs from getting close. they are mad over a movie made in the u.s. >> the united states government had nothing to do with this video. we absolutely reject its content and message. >> reporter: so far, more than 200 people have been hurt in protests at 11 u.s. compounds, four killed in libya earlier this week. the protesters are a mix of islamic hard liners and huligans. christopher stevens was killed as protesters attacked on tuesday. also killed, sean smith and two former navy s.